Safety device for boilers.



R. J. HOGAN. SAFETY DEVICE FOR BOILERS.

APPLICATION FILED SEPT. 30, 1911.

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R. J. HOGAN. SAFETY DEVICE POB. BOILERS'.

APPLICATION FILED SEPT. so, 1911.

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Y. ,I Specicaton of Letters Patent.

Patented Aug. 20, 1912.

.Application led September 30, 1911.v Serial No. 652,128.v

To\a'll whom t may concern:

Be it known that I, RICHARD J. HOGAN, a citizen of the United States,vresiding at Pocatello, countyr of Bannock, State of Idaho, have invented certain new and' useful Improvements in Safety Devices for Boilers, of which the following is a specifi# be apparent from the accompanying drawings, in which,

Figure 1 shows my invention as applied to a locomotive boiler. Fig. 2 shows the invention as applied to a water tube boiler. Fig. 3 shows the invention as applied to a tubular boiler. Figs. 4, 5 and 6 show various forms of the fusible plugy which I use inthe dierent types of boilers.

. Referring to Ffg. 1, I have shown a locomotive boiler 2O of the usual construction, having a re-box 21, grates 22 and fountain 23. Above 4the crown-sheet 24 I arrange one or more pipes 25, which have their lower ends provided with fittings 26, preferably of copper and having fusible plugs 27, lying adjacent to the crown-sheet 24. The pipes 25 are suitably connected, as shown, lwith the pipe 28, leading throughthe stung-box 29, p

1n the outer shell 30 of the boiler. The pipe 28 leads to the valve body 31, which is secured to the cylinder 32, carried on a suitable bracket' 33, which is attached to the 5o l .40, havin shell 30 of the boiler by means of suitable bolts 34. The valve body 31 is provided with a suitablegvalve 35, adapted to be opened by pressure within the valve body.

The valve 35 opens into a chamber 36, which communicateswith the lower portion of the valve chamber 37, in which-the-piston valve 38 slides. A pipe 39 is arranged to connect the fountain 23 or `any other suitable source of steam pressure with the valve chamber 37. Within the cylinder 32 is arranged a piston attached thereto the piston-rod- 41, extending through the u per head 42 of the cylinder. The portion o the cylinder 32,

above the piston 40, is in open communica,

tion with the external atmosphere, as by means of the space in the head 42, surrounding the ypiston-rod 41. A port 43 forms a means of communication between thevalve chamber 37 and the cylinder 32, below the piston 40. The bracket 33 is provided With the upwardly extending arm 44, to which is pivotally connected the lever 45. This lever has a loose pivotalconnection with the piston-rod 416, as indicated at 46, and a similar connection with the valve stem 47, as at 48. The valve steni47 extends through the stuing-box 49 of the valve body 50, provided.

with the valve 51, arranged to open downwardly into the steam space of the boiler. A pipe 52 communica'ts with the side of the valve body 51 and lea s around the exterior of the boiler and projects into the fire-box 21, substantially on a level with the grate 22, as shown at 53.` There will preferably be two of the pipes 52, leading from opposite sides of the valve body 50 and around the opposite sides of the boiler and, if desirable,

I may arrange several branches leading to.v

different points of the fire-box in the manner shown at 53.

The operation of the mechanism. just described is as follows: In case the water level in the boiler gets below the top of the crownsheet 24, the latter will be overheated andv the fusible plug 27 will melt and allowV the steam to pass up through the pipe 28 and lift the valve 35 off its seat. This will admit pressure to 'the bottom of the piston valve 38 and force the same tothe upper end of the ychamber 37, thereby admit-ting steam from the pipe 39 to the cylinder 32, below the piston 40. The pressure acting onmthe piston 40 will lift the latter and open the valve 51, allowing steam to pass from,y

the boiler through the pipe or pipes 52 to thel fire-box and thus put out the lire and at the same time ,relieve the pressure in the boller and prevent further overheating of thfe l against the upper side of one of the tubes 57 -I of the top row. The plug 56 will be -pref erably arranged in contact with the highest point ofthe tube 57, as this will be the portion of the tube which will be first affected by the vheat in case of low water. The

' other portion ofthe mechanism' will be arrangedin a manner'similar that shown lar boilerof the usualform, having my invention applied thereto. In this yinstance a Y' pipe 58 extends into the boiler and has its end provided with thefusiblelplug 59, arranged in contact with the outer surface of one ofthe tubes 60', at a point just below the lowest allowablewater level. The pipe l 58, in thls constructlon, corresponds to the adapted for 'use in horizontal tubular and' marine boilers-of the' fire tubetype. Fig. 5

shows a construction adapted for use in water tube boilers, where it is desirable to bring the pipe 25 into the boiler substantially par;

i culate between the fusible metal 4and the.

allel with the tube. Fig. 6 shows a construe-- tion for use in boilers of the type shown-in Fig. 3. It.will be observedthat in all of the various formsv shown in Figs.4 to 6, I employ corrugations to allow water'to cirheating surface of the boiler.

A It will be'un'derstood that the area of the val-'ve 51 and the piston 40 may be varied, as desired, by changing the relative length of the arms ofthe lever and also that. many modifications may be made in the details of construction without departing from the spirit of 'my invention as defined the following cla-ims. Having thus. described my invention, what 1. In` a device of theclass described, the comblnation of a boiler, a pipe having one end projecting into the rebox of the boiler and adapted to discharge'onto the firetherein, and having its other end leadingtothc lnterior of the boiler, a piston-actuated valve for .normally closing communication between Asaid pipe and the interior of 'the boller, and means for supplying,steam to .said piston and comprising a pipe extending into the boiler and having its end prov1 ed with closing means arranged close to a heating-surface of the boiler, and said closing means being adapted ,to automatically e open when said end is above the Vwater in the boiler.v

2. In a device of the class described, the

-In Fig. 3 I have shown an-.upright tubu- 1,086,494 t. i p

combination of a boiler, a pipe havin one end projecting into the, fire-box of the oiler and adapted to discharge onto the -re therein, and its other end leading to the interior of the boiler, a valve for normally closing communication between said pipe and the interior bf the boiler, a piston for actuating said valve, and means for controlling said piston and comprising a conduit having one 6nd arranged close to a heating ysurface of the boiler and provided with a fusible plug, and a valve in said conduit adapted tobe opened by the pressure in said conduit when an opening is formed through said fusible plug.A

combination of a boiler, a pipe having one end projecting into the fire-box ofthe boiler and adapted to discharge onto the lire vtherein, and its other end leading to the interior of the boiler, a valve for normally closing In a device 'ofthe .class described, the i communication between said pipe and the interior of the boiler, a cylinder having a pist-on therein, means connecting said piston and. said valve, and means for controlling said piston and comprising a conduit having one end arranged close 'toa heating surface of the boiler and provided with a fusi.- ble plug, a conduit for supplying steam to said cylinder, a valve in said conduit adapted to' be' actuated by the pressure in said first-mentioned conduit when an opening is formed through said fusible plug.

4. In a device of the class described, the

combination of a boiler, a pipe for convey.

ing steam to the exterior of the boiler and having an end arrangedwithin the boiler and in close proximity toa heating surface of the boiler,- anda fusible plug in said pipe and substantially in contact with a heating surface of the boiler and having its outer surface corrugated to permit water' to 'circulate between the face of the boiler.

5.In a device of the class described, the' combination of a pipe adapted to bed arranged within'a boiler with one end thereof in closel proximity to a heating surface of the boiler, and a fusible plug in the end of the pipe and having its outer surface substantiallyin contact with a heating surface plug and the heating surof the boiler and provided with indentations A adapted to permitwat'er to circulate there'4 through, `as and for the purpose described.

In testimony whereofI aiiix my signature -in presence of two witnesses.

RICHARD J. notan.v

Witnesses:

J. J. CLooNoN, C. P. RALPH. 

